Question

某商店买进一批蚊香,按希望获利40%定价,卖出90%后,再打7折将剩余蚊香卖完,实际获利比希望获利少了15%

Answer 1

设买进这批蚊香要x元.

(（1+40%)*90%+(1+40%)*10%*7/10)X=x+40%*(1-15)%x+300

(1.4*0.9+1.4*0.1*o.7)x =x+0.34x+300

1.358x =1.34x+300

l两边同减去1.34x得 0.018x =300

x =16666.67元